3. The genetic code is commaless, which means that no codon is reserved for punctuations. It means that after one amino acid is coded, the second amino acid will be automatically, coded by the next three letters and that no letters are wasted as the punctuation marks (Fig.
Summer solstice is the first day of summer - it's usually between June 20th and June 23rd. In 2016, the summer solstice takes place on June 20th. We know it's summer because the earth's axis tilts toward the sun from June to September - this means warmer weather and longer days.
Quick Answer. The season of summer begins with the summer solstice. The summer solstice is the day in which the most amount of sunlight occurs during the day. In the Northern Hemisphere, the summer solstice is around June 21st. In the Southern Hemisphere, it takes place around December 21st.